
class Counter {
    private int count = 0;
     synchronized public static void dowork() {
         synchronized (Counter.class) {

         }
     }

     synchronized public void add() {
         count++;
     }

     public int getCount() {
         return count;
     }
}

public class Demo17 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });

        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();

        System.out.println(counter.getCount());
    }
}
